{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-47327",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47327",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T14:35:39.816Z",
    "updatedAt": "2026-05-11T13:52:20.041Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails\n\narm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the\nrefcount of the \"smmu\" even though the return value is less than 0.\n\nThe reference counting issue happens in some error handling paths of\narm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get()\nfails, the caller functions forget to decrease the refcount of \"smmu\"\nincreased by arm_smmu_rpm_get(), causing a refcount leak.\n\nFix this issue by calling pm_runtime_resume_and_get() instead of\npm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount\nbalanced in case of failure.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "d4a44f0750bb9bf7c44c22444a482756b2344a79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3761ae0d0e549f2acdaf11f49df4ed06d256b20f"
            },
            {
              "version": "d4a44f0750bb9bf7c44c22444a482756b2344a79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c4007596fbdabc29f858dc2e1990858a146b60b2"
            },
            {
              "version": "d4a44f0750bb9bf7c44c22444a482756b2344a79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fbf4daa6f4105e01fbd3868006f65c163365c1e3"
            },
            {
              "version": "d4a44f0750bb9bf7c44c22444a482756b2344a79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fe92c058199067ae90cf2a901ddf3c271893557a"
            },
            {
              "version": "d4a44f0750bb9bf7c44c22444a482756b2344a79",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1adf30f198c26539a62d761e45af72cde570413d"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.0"
            },
            {
              "version": "5.4.134",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.52",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.12.19",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.12.*"
            },
            {
              "version": "5.13.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.13.*"
            },
            {
              "version": "5.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}